Process for rendering fibrous materials noninflammable



Patented Dec. 12, 1933 uirso s'rArEs PATENT OFFICE PROCESS FOR BENDERING FIBROUS NINFLAMMZABLE MATERIALS N0 Rudolf Engelhardt, Leverkus'en-on-the-Bhine, Germany, assignor to I. G. Farbenindustrie Aktiengesellschatt, Frankfort on the Main,

Germany No Drawing. Application January 13, 1931,

Germany Serial No. 508,561, and in 8 Claims.

ture, for example, in Lange, Chemisch-Technische Vorschriften, 1923, vol. 2, page 404 and Th. Koller, Die Impragnierungstechnik, 1923. After the drying, an additional covering of a wax is customarily applied in order to exclude moisture from the water soluble salts. This covering must obviously also-be non-inflammable. In practice it has been found to be of particular advantage for this purpose to employ trichloronaphthalene, tetrachloronaphthalene and higher chlorinated naphthalenes or mixtures thereof, obtainable directly by chlorination of naphthalene.

In accordance with the present invention naphthalenes chlorinated only about to the dlchloronaphthalene stage, are employed in the process 0! rendering fibrous materials non-inflammable although they are themselves inflammable. The application of the dichlorinated naphthalene presents the great technical advantage that the treatment or the pretreated :iibre can be carried out at ordinary temperature, since the technical mixture of dichloronaphthalene is either liquid or possesses a very low melting point, depending on the particular process of manufacture.

The following example will further illustrate chlorination of naphthalene and the excess'th'ere- January 2. In the process of rendering fibrous materials non-inflammable the step which consists in applying to said material dichlorinated naphthalene subsequent to the impregnation with an aqueous solution or ammonium biphosphate and to drying. 3. In the process of rendering non-inflammable a wire covered with cotton the step which consists in applying to the cotton dichlorinated.

naphthalene subsequent to the impregnation with an aqueous solution of an inorganicsalt custornarily used for rendering non-inflammable fibrous material and to drying.

4. In the process of rendering non-inflammable a wire covered with cotton the step which consists in applying to the cotton dichlorinated naphthalene subsequent to the impregnation with an aqueous ammonium biphosphate solution of 15% strength and to dry I 5. Fibrous materials preliminarily impregnated with an aqueous solution o! an inorganic salt customarily employed to render fibrous material non-inflammable, and after drying subsequently impregnated with dichlorinated naphthalene.

6. Fibrous materials preliminarily impregnated with an aqueous solution of ammonium biphosphate, and after drying subsequently impregnated with dichlorinated naphthalene.

I. A wire covered with a textile material, said material being preliminarily impregnated with an aqueous solution of an inorganic salt customarily employed to render fibrous material nonble, and after drying subsequently impregnated with dichlorinated naphthalene.

8. A wire covered with cotton, said cotton being preliminarilyimpregnated withan aqueous solution of ammonium biphosphate or about 16% strength, and after drying subsequently impregnated with dichlorinated naphthalene.

RUDOLF ENGELHARDT.

of is removed by draining or short centriiuging.

. for rendering non-ble fibrous material andtodryins. 

